Thick-film hydrogen sensor

Mishra, Vishnu Narayan; Agarwal, R.P.

doi:10.1016/0925-4005(94)01242-3

Cited by 27 publications

(6 citation statements)

References 7 publications

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“…As the TG concentration experienced by A is , the transient response of the capillary-attached gas sensor (CGS) will take the following form (8) Replacing from (6) in (8) results in the general form of the transient response of the CGS to a gas mixture (9) Equation (9) is valid for a linear sensor. The linearity approximation, on the other hand, can only be applied if all of the components of the gas mixture are of low concentrations.…”

Section: )mentioning

confidence: 99%

A Novel Approach to Hydrogen Sensing

Hossein‐Babaei

Orvatinia

2004

IEEE Sensors J.

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A novel sensor for the selective detection of hydrogen in the presence of other reducing gases is presented. The device comprises a commercially available non-or partially-selective semiconductor gas sensor and an air filled centimeter-long capillary tube. The attachment is so that upon exposure, the target gas diffuses in air through the length of the capillary before affecting the sensor. The hydrogen component of the gas mixture diffuses much faster than other components, and is sensed at an earlier stage of the sensor response. The response of a capillary-attached gas sensor (CGS) to a gas mixture containing hydrogen is mathematically analyzed. The results indicate that the hydrogen concentration can readily be extracted from certain mathematical features of the transient response. The fabrication of a prototype CGS and experimental verification of the analytical results are reported. The prototype can measure hydrogen concentration at the presence of other reducing and combustible gases exceeding its concentration by two orders of magnitude.

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Section: )mentioning

confidence: 99%

A Novel Approach to Hydrogen Sensing

Hossein‐Babaei

Orvatinia

2004

IEEE Sensors J.

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“…[110][111][112][113][114][115] Furthermore, with proper manipulation of the microstructure or crystalline phase and/or the addition of the proper impurities or surface functionalization, titania can also be used as a reducing gas sensor. [116][117][118][119][120][121][122][123][124][125][126][127] The interaction of a gas with a metal oxide semiconductor is primarily a surface phenomenon, and nanoporous metal oxides 1221 1231 1281 129 offer the advantage of providing large sensing surface areas.…”

Section: Hydrogen Sensing With Titania Nanotubesmentioning

confidence: 99%

Metal Oxide Nanoarchitectures for Environmental Sensing

Varghese

Grimes²

2003

j nanosci nanotechnol

223

132

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Metal oxide materials are widely used for gas sensing. Capable of operating at elevated temperatures and in harsh environments, they are mechanically robust and relatively inexpensive and offer exquisite sensing capabilities, the performance of which is dependent upon the nanoscale morphology. In this paper we first review different routes for the fabrication of metal oxide nanoarchitectures useful to sensing applications, including mesoporous thin films, nanowires, and nanotubes. Two sensor test cases are then presented. The first case examines the use of highly uniform nanoporous Al2O3 for humidity sensing; we find that such materials can be successfully used as a wide-range humidity sensor. The second test case examines the use of TiO2 nanotubes for hydrogen sensing. Going from a nitrogen atmosphere to one containing 1000 ppm of hydrogen, at 290 degrees C, 22-nm-diameter titania nanotubes demonstrate a 10(4) change in measured resistance with no measurement hysteresis.

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“…It is inevitable to have a continuous control of these hazardous gases in an atmosphere. The gases such as CO [1][2][3], H 2 [4], C 2 H 5 OH [5], CO 2 [6,7], NO x [8][9][10][11], O 2 [12][13][14], CH 4 [15], NH 3 [16,17], H 2 S [18,19], C 2 H 2 , C 2 H 4 , C 3 H 6 [20], LPG [21] etc. have to be controlled for the healthy survival of the living beings.…”

Section: Introductionmentioning

confidence: 99%